Titled ‘the power of negawatts’, the report says that with a scheme in place demand for electricity in the UK could plummet by as much as 40%. And this would save British homeowners around GBP10billion in energy bills. The Green Alliance says this could be a “one off opportunity to save money.” All you need to know in our 10-minute guide to double glazed windows.

Aluminium is another option, but this could also be at the upper end of the prices bracket. UPVC comes somewhere in the middle closely foolowed by engineered timebrs in terms of prices. – to learn more take a look at this ultimate guide to prices.